Skip to main content

Internet Archive's in-browser bookreader "theater" requires JavaScript to be enabled. It appears your browser does not have it turned on. Please see your browser settings for this feature.

Project Sign Microfilm Reels

by: United States Air Force

Usage: Public Domain Mark 1.0

Topics: UFO, UFOs, Unidentified Flying Object, Unidentified Flying Objects, Air Force, U.S. Air Force, Blue Book, Project Blue Book

Collection: project-blue-book; ufo-files; nationalsecurityarchive; additional_collections

Language: English

The first named Air Force investigation of the UFO phenomenon was Project Sign. Of the original nine rolls of Project Sign microfilm, four were given to Dr. Herbert Strentz in 1968 by Lt. Col. Hector Quintanilla to use in the preparation of his Ph.D. dissertation. Two additional microfilms from the Project Sign collection were preserved by Dr. J. Allen Hynek. There are no known extant copies of the remaining three Project Sign microfilm rolls. Many of the reports contained in the Project Sign microfilm collection are duplicated in the Project Blue Book microfilm collection but the quality of the Project Sign versions of these documents is often superior.

Project Sign Roll 1 Incidents 1 - 73
Project Sign Roll 2 Incidents 73 - 172 (Incident #162 11 August 1948, Hamel, MN not found)
Project Sign Roll 3 Incidents 172 - 178 (Incident #177 5 September 1948, Kentwood, LA not found)
Project Sign Roll 7 Incidents 186 - 237
Project Sign Roll 8 Incident Summary Sheets 173 - 250 and Incident Checklists 1 - 95

Description and digitization courtesy of Blue Book Archive.

Addeddate: 2023-04-30 23:47:10

Identifier: usaf-signm

Identifier-ark: ark:/13960/s2wzh649g2g

Ocr: tesseract 5.3.0-3-g9920

Ocr_detected_lang: en

Ocr_detected_lang_conf: 1.0000

Ocr_detected_script: Arabic

Ocr_detected_script_conf: 0.5402

Ocr_module_version: 0.0.21

Ocr_parameters: -l eng

Page_number_confidence: 19.56

Pdf_module_version: 0.0.22

plus-circle Add Review

comment
Reviews

There are no reviews yet. Be the first one to write a review.

615 Views

5 Favorites

DOWNLOAD OPTIONS

CHOCR

3.3M

USAF-SIGN1_chocr.html.gz

5.4M

USAF-SIGN2_chocr.html.gz

1.2M

USAF-SIGN3_chocr.html.gz

7.0M

USAF-SIGN7_chocr.html.gz

3.9M

USAF-SIGN8_chocr.html.gz

3.9M

USAF-SIGNM_chocr.html.gz

EPUB

USAF-SIGN1.epub

USAF-SIGN2.epub

USAF-SIGN3.epub

USAF-SIGN7.epub

USAF-SIGN8.epub

USAF-SIGNM.epub

249.4K

USAF-SIGN1_djvu.txt

402.7K

USAF-SIGN2_djvu.txt

87.8K

USAF-SIGN3_djvu.txt

524.9K

USAF-SIGN7_djvu.txt

290.8K

USAF-SIGN8_djvu.txt

285.4K

USAF-SIGNM_djvu.txt

HOCR

6.8M

USAF-SIGN1_hocr.html

11.1M

USAF-SIGN2_hocr.html

2.3M

USAF-SIGN3_hocr.html

14.2M

USAF-SIGN7_hocr.html

7.6M

USAF-SIGN8_hocr.html

8.3M

USAF-SIGNM_hocr.html

ITEM TILE

6.9K

USAF-SIGN1_hocr_pageindex.json.gz

8.4K

USAF-SIGN2_hocr_pageindex.json.gz

1.3K

USAF-SIGN3_hocr_pageindex.json.gz

8.1K

USAF-SIGN7_hocr_pageindex.json.gz

4.4K

USAF-SIGN8_hocr_pageindex.json.gz

10.8K

USAF-SIGNM_hocr_pageindex.json.gz

OCR SEARCH TEXT

107.3K

USAF-SIGN1_hocr_searchtext.txt.gz

186.5K

USAF-SIGN2_hocr_searchtext.txt.gz

39.3K

USAF-SIGN3_hocr_searchtext.txt.gz

221.1K

USAF-SIGN7_hocr_searchtext.txt.gz

119.1K

USAF-SIGN8_hocr_searchtext.txt.gz

143.8K

USAF-SIGNM_hocr_searchtext.txt.gz

PAGE NUMBERS JSON

112.4K

USAF-SIGN1_page_numbers.json

132.9K

USAF-SIGN2_page_numbers.json

18.2K

USAF-SIGN3_page_numbers.json

131.7K

USAF-SIGN7_page_numbers.json

71.1K

USAF-SIGN8_page_numbers.json

177.4K

USAF-SIGNM_page_numbers.json

PDF

133.2M

79.1M

15.1M

60.2M

35.5M

385.9M

7.0M

USAF-SIGN1_text.pdf

8.3M

USAF-SIGN2_text.pdf

2.0M

USAF-SIGN3_text.pdf

8.4M

USAF-SIGN7_text.pdf

4.3M

USAF-SIGN8_text.pdf

8.2M

USAF-SIGNM_text.pdf

SINGLE PAGE PROCESSED JP2 ZIP

44.5M

USAF-SIGN1_jp2.zip

43.3M

USAF-SIGN2_jp2.zip

9.1M

USAF-SIGN3_jp2.zip

49.1M

USAF-SIGN7_jp2.zip

22.6M

USAF-SIGN8_jp2.zip

195.7M

USAF-SIGNM_jp2.zip

TORRENT

71 Files
11 Original

SHOW ALL

IN COLLECTIONS

Project Blue Book

National Security Internet Archive (NSIA)

Additional Collections

Uploaded by Paul Galante on April 30, 2023

SIMILAR ITEMS (based on metadata)

Terms of Service (last updated 12/31/2014)